:root{--color-primary:#2454ff;--color-primary-hover:#1a3fd1;--color-primary-light:#e8edff;--color-bg:#f4f5f9;--color-surface:#fff;--color-text:#16182b;--color-text-muted:#6b7280;--color-border:#e3e5ec;--color-success-bg:#d1fae5;--color-success-text:#065f46;--color-warning-bg:#fef3c7;--color-warning-text:#92400e;--color-danger-bg:#fee2e2;--color-danger-text:#991b1b;--color-danger:#dc2626;--color-danger-hover:#b91c1c;--color-info-bg:#e0e7ff;--color-info-text:#3730a3;--color-neutral-bg:#e5e7eb;--color-neutral-text:#374151;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--shadow-sm:0 1px 2px #0f172a0f;--shadow-md:0 8px 24px #0f172a14;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-5:1.5rem;--space-6:2rem;--font-xs:.75rem;--font-sm:.85rem;--font-base:1rem;--font-lg:1.15rem;--font-xl:1.5rem}*{box-sizing:border-box}body{background:var(--color-bg);color:var(--color-text);margin:0;font-family:system-ui,-apple-system,Segoe 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.4rem}.chat-bubble-row.own .chat-time{color:#ffffffd9;background:#ffffff26;border-color:#0000}.chat-input-row{gap:var(--space-2);display:flex}.chat-input-row input{border:1px solid var(--color-border);border-radius:var(--radius-sm);font-family:inherit;font-size:var(--font-base);flex:1;padding:.5rem .6rem}.unread-badge{background:var(--color-danger);color:#fff;border-radius:999px;justify-content:center;align-items:center;min-width:1.1rem;height:1.1rem;margin-left:.3rem;padding:0 .3rem;font-size:.65rem;font-weight:700;display:inline-flex}@media (width<=640px){.page-container,.auth-page{padding:var(--space-3)}.auth-form{padding:var(--space-4);max-width:100%}.app-header,.dashboard-header{align-items:stretch;gap:var(--space-3);padding:var(--space-3) 0;flex-direction:column}.app-header-user{flex-wrap:wrap;justify-content:space-between}.profile-card{flex-direction:column;align-items:flex-start}.chat-bubble-col{max-width:85%}.card{padding:var(--space-4)}.card 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